Type-writer attachment.



Z. HSIEH AND G. CHOW.

TYPE WRITER ATTACHMENT.

APPLICATION FILED FEB. I, 1919.

1,326,346; Patented Dec. 30,1919.

INVENTORS Zen his/eh fieoryc (haw WMJL ATTORNEY at any desired distance from one end of the the num er of lines have been typed and means UNITED STATES PATENT OFFICE.

ZEN HSIEH AND GEORGE CHOW, OF WILKINSBUR, PENNSYLVANIA.

TYPE-WRITER urmcmmnr.

Specification of Letters Patent.

Patented Dec. 30, 1919.

Application filed February 1, 1919. Serial No. 274,453.

()ur invention relates to'ty-pewriting machines and therefor.

()ne object of our invention is to provide an attachment for a typewriter that shall be adapted to indicate the number of lines typed, the number of inches of paper used, and that shall have means for preventing advancement of the paper when the sheet has been typed to a definite vertical margin.

Another object of our invention is to provide an attachment, of the above indicated character,- that shall have a relatively long scale, be simple and inexpensive to construct, easily applied to existing typewriters and effective in-its operation.

In practising our invention, we provide a worm screw that is adapted to be secured to-the 'shaft of the typewriter platen. A guiding member upon which is marked a scale is secured to the carriage of the typewriter and a pointer and a stop men-iber are slidably mounted thereon. The pointer is adapted to engage the grooves of the worm screw and is thus advanced in accordance with the advance of the platen to indicate in cooperation with scales, that are marked on the worm screw, the number of lines typed and in cooperation with the scale on the guiding member the number of inches of paper typed. The stop member may be set particularly'i to attachments guiding member to thus limit the lower vertical margin on the sheet to be ty ed. Pins may be dlsposed in the grooves o the worm screwfor sto ping the further advance of laten w on a definite predetermined may be provided for turning the worm screw relative to the shaft of the platen to return the same-t0 its initial position.

'Figure 1 of the accompanying drawings is a frontview, partially 1n section and partially in elevation, of a typewriter embodyin; our invention; Fig. 2 is a. view. taken carriage 2 of the provided with a shoulder 17 screw 16 is of the worm screw 16 along the line II1l ot' Fig. 1 and Fig. 3 is a detail view of a pin that may be used in our invention.

An attachment 1, embodying our invention, may be applied to the carriage 2 of an ordinary typewriter 3 without altering the structure of the same.

A guiding member 4 is secured to the typewriter by screws 5 and-comprises a polygonal bar member 6 and' a supporting member 7. A scale '8 is marked on the member 6 and members 9 and 10 are slidably disposed thereon. A

knob member 11 that is usually mounted on the shaft 12 that carries the platen 13 of an ordinary sleeve 14 having notches 15 along one edge typewriter is removed, and a thereof is disposedat the end of the shaft 12. The knob 11 is secured to the sleeve H by any suitable means for the purpose of turning the platen 13.

1+ and is prothe notch portion 15- of the sleeve 14 by a spring 18. By withdrawing the pin 17, the worm screw 16 may be turned relatively to the shaft 12 and the platen 13 to thus re- The pin 17 turn it to its initial position.

that may ong e the outer edge of the pin slot to hold the pin out of engagement with the portion 15 on the sleeve 14 when desired. The worm provided with a plurality of scales 19 and 20 representing the number oi lines typed .with. sin le, double or triple spacing. A pin 21 is isplosed in the groove anc member 9. A spring 22 is ada )ted to hold the pin 21 in engagement with the worm screw 16 and a knob 23 is rovided for lifting the' pin 21 against tiie action of the spring 22. A slot 24, in one side of the member 9, is provided for receiving or holdmg the knob 23 in such position that the 1n the groove of theworm screw 16 at the point corresponding to the exact number of A worm screw 16 is disposed around the sleeve vlded with a pin 17 that is pressed against is carried by the lines desired to be typed. Openings are provided in the member 4 to receive the pins 26 when they are not in use.

When a sheet. of paper is inserted between the platen 13 and the guide melnber 27 of the typewriter, the pin 17 is -aised and the worm screw 16 is turned until the pin 21 engages with the zero marking on the scales 19 and 20 or until the pin 17 is adjacent a mark :27 on the carriage 2. This, of course, may also be done by simply holding the paper and turning the knob 11. However, for convenience, the worm screw 16 is relatively movable with respect to the paper when desired. The stop member 10 is disposed in such position that, as the paper is advanced by/ reason of the turning of the platen 13, the member 9 will be advanced along the. guiding member 6 until it engages the member 10. \Vhen this obtains, the pin 21 will wedge between the member 10 and the grooves of the worm screw 16 and preclude further movement of the paper, tllllH insuring any desired vertical margin at the bottom of the sheet. If it is desired to type a predetermined number of lines, the pin 26 may be disposed in the groove of the worm screw 16' at the position corresponding to this exact num er of lines on the scales 19 and 20. \Vhen the pin 21 engages the pin 26, further movement of th platen 13 will be precluded. Since the scales marked on the worm screw are relatively longer than the scale that is marked on the guiding. member, relatively greater accuracy may be obtained by the use of the pins 26. also th reading of the scales is greatly facilitated.

The essential features of our invention are that it provides a relatively long scale,

it may be attached to any ordinary type writer. without the use of auxiliary gear wheels, belts, pulleys and other kindred devices, and the attachment of the same to typewriters may be accomplished in a mini-' mum period of time by simply securing a supporting member to the carriage of the typewriter, removing the actuating knob of the ,platen and providing a sleeve for the shaft of the platen that will receive the operating mechanism without requiring any machining of the ty iewriter itself ()ur invention is not limited to th structural detailsillustrated, as it may be variously modified without departing from the spirit and scope of the invention, as set forth in'the appended claims;

We claim as our invention:

1. In a typewriter, the combination with a carriage, a platen thereon and a knob for turning the platen, of a worm screw loosely disposed on the shaft of the platen ,independent of the turning knob, a movable pin for securing the worm screw in position on the shaft, a mark on the carriage for cooperating with the pin to indicate the proper position of the worm screw and an indicating member actuated by the worm screw. In a typewriter, the combination with a carriage, a platen thereon and a knob for turning the platen, of a worm screw loosely disposed on the platen shaft independent of the knob, a spring-pressed pin for securing the worm screw on the shaft, means for cooperating with the pinto indicate the correct position of the worm screw, and an indicating member actuated by the worm screw.

3. In a typewriter, the combination with a platen shaft and a worm screw loosely disposed therearound, of a spring-pressed 'pin for operatively connecting the worm -screw to the platen shaft, an indicating member actuated by the worm screw, and means for cooperating with the pin to determine the correct relative position of the worm screw. I a

In testimony whereof, We have hereunto subscribed our names this 29th day of J an.,

' ZEN HSIEH.

GEORGE CHOW. 

